Off Midget Ganglion Cell

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There appears to be a further subcategory for the on midget ganglion cell. Calkins et al, provide anatomical evidence which suggests that one can discriminate between midget ganglion cells by the class of cone it receives input from. Unfortunately, it is not possible to firmly label one class as red/long and the other as green/medium. So, I distinguish between the two categories using the Calkins PhD terminology of "small" for the ganglion with fewer synapses and "large" for the ganglion cell with more synapses.

For a patch of 94 cone-midget ganglion circuits, 59 were large circuits and 45 were small circuits (a ratio of 1.3).

It is suggested that midget ganglion cells provide from 80% to 95% of the ganglion cell poplulation.

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© 1995 Lance Hahn (